What if there is no RAM in a computer?

No. A computer needs at least 512mb of ram to operate, and 2gb of ram to operate efficiently.

RAM is a necessity in order to do anything on your computer.

If you try to boot your computer without the RAM, your computer will generate a blue-screen and be stuck in a boot-loop, restarting it self and generating the same blue screen over, and over, and over, and over, and over until you force it to power off.